Tungsten Disulfide / Lithium Grease Composite Performance Evaluation
As a new type of solid lubricating material, tungsten disulfide has excellent lubricity and environmental strain ability. It is a high-end precision industrial lubricating material.
Tungsten disulfide is suitable for lubrication in various harsh conditions such as high temperature, heavy load, high pressure, high vacuum, high speed, high radiation, strong corrosion and ultra-low temperature. It has important application value in the fields of aviation, spaceflight and defense industry.
Lithium grease is made from natural fatty acid (stearic acid or 12- hydroxy stearic acid lithium soap), made of mineral oil or synthetic thickener of lubricating oil, the added antioxidants, anti rust agent and extreme pressure agent, has become a multi effect long-life grease, can replace calcium base grease and sodium base grease, bearing lubrication for aircraft, automobiles, tanks, machine tools and various mechanical equipment. Undoubtedly, lithium-based grease (oil) is the ideal carrier of tungsten disulfide, the addition of high-temperature lithium-based grease lubricating grease (oil) to achieve a substantial increase in lubrication performance.
According to GB/T 3142 method, the MQ-800 four ball friction testing machine was used to test the bearing capacity of grease, the ball is made of GCr15, the diameter of 12.7000 mm. In the experiment, it was found that tungsten sulfide has the advantage.
1.The bearing capacity, WS2 additives can improve the bearing capacity of the grease, grease containing 2% WS2 additive mass fraction 112.8% more than the base grease in the maximum card-free bite loading (PB), the sintering load ) was 84.3% more than the base fat.
2.Friction coefficient: compared with base grease, the addition of WS2 additive can effectively reduce the friction coefficient, in which the grease with mass fraction of 2%WS2 is the best, the average friction coefficient is 0.115, which is lower than that of base grease 17.3%.
3.Effect of wear quantity, WS2 powder with different mass fraction as lubricating grease additive on wear performance.
It can be found that tungsten sulfide plays a critical role in the lithium complex grease agent, in the process of friction, two tungsten sulfide powder can play the effect of nano scale adsorption and deposition on the friction surface pits, so as to repair; At the same time, under high temperature and high load conditions, WS2 nanoparticle penetrating layer is formed, and the tungsten disulfide nano-powder chemically reacts with the surface of the friction pair to form a chemical protective film containing WO3 and Fe3O4 so as to improve the lubricating effect. This is why tungsten disulfide can become a high-end precision industrial lubricants.
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